Zimbabwe's state media report several police officers have been questioned in connection with a bomb blast Saturday at the Harare Central Police Station.
The Herald newspaper Wednesday, citing sources close to the investigation, says a number of policemen and detectives are suspected of being involved in the bombing.
A police spokesperson contacted by the paper would not confirm whether police were being investigated.
According to the Herald, investigators recovered two unexploded bombs at police headquarters following the blast.
Initial reports said no one was injured.
The incident occurred on the same day Zimbabwe's ruling and opposition parties resumed talks on a power-sharing government, to end a crisis over this year's controversial presidential elections.
Some information for this report was provided by AFP.